From 8c0ae778e2874f3742bd619000b791d178c187e2 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 19 Jan 2022 10:10:50 +0100 Subject: ALSA: core: Simplify snd_power_ref_and_wait() with the standard macro Use wait_event_cmd() macro and simplify snd_power_ref_wait() implementation. This may also cover possible races in the current open code, too. Reviewed-by: Jaroslav Kysela Link: https://lore.kernel.org/r/20220119091050.30125-1-tiwai@suse.de Signed-off-by: Takashi Iwai --- sound/core/init.c | 25 +++++-------------------- 1 file changed, 5 insertions(+), 20 deletions(-) (limited to 'sound') diff --git a/sound/core/init.c b/sound/core/init.c index ac335f5906c6..31ba7024e3ad 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -1111,29 +1111,14 @@ EXPORT_SYMBOL(snd_card_file_remove); */ int snd_power_ref_and_wait(struct snd_card *card) { - wait_queue_entry_t wait; - int result = 0; - snd_power_ref(card); - /* fastpath */ if (snd_power_get_state(card) == SNDRV_CTL_POWER_D0) return 0; - init_waitqueue_entry(&wait, current); - add_wait_queue(&card->power_sleep, &wait); - while (1) { - if (card->shutdown) { - result = -ENODEV; - break; - } - if (snd_power_get_state(card) == SNDRV_CTL_POWER_D0) - break; - snd_power_unref(card); - set_current_state(TASK_UNINTERRUPTIBLE); - schedule_timeout(30 * HZ); - snd_power_ref(card); - } - remove_wait_queue(&card->power_sleep, &wait); - return result; + wait_event_cmd(card->power_sleep, + card->shutdown || + snd_power_get_state(card) == SNDRV_CTL_POWER_D0, + snd_power_unref(card), snd_power_ref(card)); + return card->shutdown ? -ENODEV : 0; } EXPORT_SYMBOL_GPL(snd_power_ref_and_wait); -- cgit v1.2.3